code: def copy(self) -> "RngStream":
      return RngStream(self.key, self.counts.copy())
  
imports: from __future__ import annotations
  import dataclasses
  import hashlib
  import typing
  import jax
  import numpy
  from flax.experimental.nnx.nnx import errors, filterlib, tracers
label_desc: Use image node_id 3 for calling the RngStream obj's underlying member method code with example usage: obj.copy() and returns: RngStream